Most of the "discussion" against sidechains is focused on saying that SC's are a backdoor method to enable altcoins, which damage the value of the mainchain. This is cypherdoc's argument above in saying that he would buy scZC at $0.006 for the upside potential.

But this is wrong, altcoins already exist today and have no practical effect on Bitcoin. Example: there are tons of "faster" altcoins and they are dying. Example: there are tons of altcoins capable of MM with Bticoin, but most are ignored by miners. In the end network effects will ensure there is only one true ledger, and that ledger is going to be Bitcoin's 21M coins. Sidechains that implement an altcoin aspect, will see that that altcoin will be as successful at today's altcoins.